Depaul Ireland is calling for increased support for single men and women who find themselves without a home.
The homeless charity said a growing number of singletons are coming through its doors looking for help.
It comes as Housing Minister Eoghan Murphy declined for the second time in two days to appear at an event to discuss the housing and homeless crisis.
Depaul Ireland boss Kerry Anthony said she would have liked the minister to have attended the launch yesterday of the charity's annual report at its emergency hostel in Little Britain Street
She said he had been invited two weeks ago. "We would very much have loved minister Murphy to have attended," she said.
"We would have liked him to have seen Little Britain Street and to hear what we have to say."
She said the minister has a busy week ahead, with the housing summit planned for Friday.
Mr Murphy angered members of Dublin City Council on Monday, when he did not turn up to discuss the housing crisis at the council's monthly meeting, despite an invitation to do so.
Cllr Christy Burke said the minister was showing "contempt" for the council.
Responding to the anger, a statement from the minister said an invitation was extended through Fine Gael councillor Paddy McCartan.
It said the minister had no problem with meeting the council and was prepared to do so. However, it also said the actions at the council were "using a crisis for political purposes".
The Depaul report said the charity supported 3,620 people at risk of homelessness last year and opened the 65-bed hostel in Little Britain Street.
It said that single men and women were the largest cohort of homeless people using the organisation's services.
Ms Anthony said single people coming into homelessness were not getting enough support.
"The largest cohort of people we work with are single people. We know that there is an increasing number of emergency beds, we know that people are rough sleeping and we know that they are primarily single people," she said.
"We have to do more for single people."
Addressing the launch, Ms Anthony spoke abut the homeless people who died in recent days, including Danielle Carroll (27), Jack Watson, who was in his 50s, and Jennifer Dennehy, who was in her 30s.